parameters = {
    urlLogin: 'http://47.106.70.15:8000/index.php/Overview/teacherLogin',
    urlSchoolList: 'http://47.106.70.15:8000/index.php/Overview/schoolList',
    srcImg: 'http://47.106.70.15:8000',
}

// 设置cookie
// days 为-1时即可清楚cookie
function setCookie(name, value, days) {
	var d = new Date;
	d.setTime(d.getTime() + 24*60*60*1000*days);
	window.document.cookie = name + "=" + value + ";path=/;expires=" + d.toGMTString();
}

// 获取cookie
function getCookie(name) {
    var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
　　 return (arr=document.cookie.match(reg))?unescape(arr[2]):null;
}
// 登录
function login(user, id) {
    setCookie('user', user, 7);
    setCookie('id', id, 7);
    setCookie('role', 'teacher', 7);
}

// 登出
function logout() {
    setCookie('user', '', -1);
    setCookie('id', '', -1);
    setCookie('role', '', -1);
}

// 检查登录
function checkLogin() {
    if (getCookie('user') != null && getCookie('id') != null && getCookie('role') != null) {
        // 有登录
        return true;
    } else {
        // 没登录
        return false;
    }
}

function ieVersion() {
    var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
    var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1; //判断是否IE<11浏览器
    var isEdge = userAgent.indexOf("Edge") > -1 && !isIE; //判断是否IE的Edge浏览器
    var isIE11 = userAgent.indexOf('Trident') > -1 && userAgent.indexOf("rv:11.0") > -1;
    if(isIE) {
        var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
        reIE.test(userAgent);
        var fIEVersion = parseFloat(RegExp["$1"]);
        if(fIEVersion == 7) {
            return 7;
        } else if(fIEVersion == 8) {
            return 8;
        } else if(fIEVersion == 9) {
            return 9;
        } else if(fIEVersion == 10) {
            return 10;
        } else {
            return 6;//IE版本<=7
        }
    } else if(isEdge) {
        return 'edge';//edge
    } else if(isIE11) {
        return 11; //IE11
    }else{
        return -1;//不是ie浏览器
    }
}
